# TPS254900AIRVCRQ1

**Texas Instruments** · Power Distribution Switches · WQFN-20-EP(3x4)

TPS254900AIRVCRQ1 from Texas Instruments, in a WQFN-20-EP(3x4). Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | IMON | output | Sources a scaled-down ratio of the current through the internal FET; a resistor from this pin to GND converts that current to a proportional voltage for use as an analog current monitor. |
| 2 | IN | power_in | Input supply voltage; connect a 0.1-µF or greater ceramic capacitor from IN to GND as close to the IC as possible. |
| 3 | IN | power_in | Input supply voltage; connect a 0.1-µF or greater ceramic capacitor from IN to GND as close to the IC as possible. |
| 4 | DM_OUT | bidirectional | D- data line to the upstream USB host controller. |
| 5 | DP_OUT | bidirectional | D+ data line to the upstream USB host controller. |
| 6 | CS | output | Linear cable compensation current output; connect to the divider resistor of the front-end dc-dc converter. |
| 7 | EN | input | Logic-level control input that turns the power and signal switches on or off; when EN is low the device is disabled and both switches are OFF. |
| 8 | CTL1 | input | Logic-level control input for setting the charging mode and signal switches, per the Device Truth Table. |
| 9 | CTL2 | input | Logic-level control input for setting the charging mode and signal switches, per the Device Truth Table. |
| 10 | OVP_SEL | input | Logic-level control input selecting the OUT overvoltage threshold: V(OV_OUT_LOW) when low and V(OV_OUT_HIGH) when high. |
| 11 | GND | power_in | Ground connection that should be connected externally to the thermal pad. |
| 12 | BIAS | passive | Used for IEC protection; typically connect a 2.2-µF capacitor and a transient-voltage suppressor (TVS) to ground, and 5.1 kΩ to OUT. |
| 13 | DP_IN | bidirectional | D+ data line to the downstream connector, with IEC 61000-4-2 protection rated ±8 kV contact and ±15 kV air discharge and battery short protection up to 18 V. |
| 14 | DM_IN | bidirectional | D- data line to the downstream connector, with IEC 61000-4-2 protection rated ±8 kV contact and ±15 kV air discharge and battery short protection up to 18 V. |
| 15 | OUT | power_out | Power-switch output, a 45 mΩ (typical) high-side MOSFET rated up to 18 V with battery short protection. |
| 16 | OUT | power_out | Power-switch output, a 45 mΩ (typical) high-side MOSFET rated up to 18 V with battery short protection. |
| 17 | STATUS | output | Active-low open-drain output asserted during load-detect conditions. |
| 18 | FAULT | output | Active-low open-drain output asserted during overtemperature, overcurrent, and overvoltage conditions. |
| 19 | ILIM_LO | input | External resistor sets the low current-limit threshold and the load-detection current threshold. |
| 20 | ILIM_HI | input | External resistor sets the high current-limit threshold. |
| 21 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | WQFN-20-EP(3x4) |
| Category | Power Supply Chip |
| Pins | 21 |

## CAD (KiCad official)

- Symbol: `TPS254900AIRVCRQ1`
- Footprint: `Package_DFN_QFN:QFN-20-1EP_3x4mm_P0.5mm_EP1.65x2.65mm`
- 3D model: WQFN-20-EP(3x4) (KiCad packages3D, STEP)
- 3D model files: `tps254900airvcrq1-etched.step` / `tps254900airvcrq1-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tps254900airvcrq1.step` / `tps254900airvcrq1.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/tps254900a-q1) (42 pp, sha256 `85f605c476d469c7`, retrieved 2026-10-11, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/tps254900airvcrq1-datasheet.pdf)